/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */
package org.apache.iotdb.confignode.client.async;

import org.apache.iotdb.common.rpc.thrift.TEndPoint;
import org.apache.iotdb.commons.client.ClientPoolFactory;
import org.apache.iotdb.commons.client.IClientManager;
import org.apache.iotdb.commons.client.async.AsyncConfigNodeHeartbeatServiceClient;
import org.apache.iotdb.confignode.client.async.handlers.heartbeat.ConfigNodeHeartbeatHandler;

public class AsyncConfigNodeHeartbeatClientPool {

    private final IClientManager<TEndPoint, AsyncConfigNodeHeartbeatServiceClient> clientManager;

    private AsyncConfigNodeHeartbeatClientPool() {
        clientManager =
                new IClientManager.Factory<TEndPoint, AsyncConfigNodeHeartbeatServiceClient>()
                        .createClientManager(
                                new ClientPoolFactory.AsyncConfigNodeHeartbeatServiceClientPoolFactory());
    }

    /**
     * Only used in LoadManager
     *
     * @param endPoint The specific ConfigNode
     */
    public void getConfigNodeHeartBeat(
            TEndPoint endPoint, long timestamp, ConfigNodeHeartbeatHandler handler) {
        try {
            clientManager.borrowClient(endPoint).getConfigNodeHeartBeat(timestamp, handler);
        } catch (Exception ignore) {
            // Just ignore
        }
    }

    // TODO: Is the ClientPool must be a singleton?
    private static class AsyncConfigNodeHeartbeatClientPoolHolder {

        private static final AsyncConfigNodeHeartbeatClientPool INSTANCE =
                new AsyncConfigNodeHeartbeatClientPool();

        private AsyncConfigNodeHeartbeatClientPoolHolder() {
            // Empty constructor
        }
    }

    public static AsyncConfigNodeHeartbeatClientPool getInstance() {
        return AsyncConfigNodeHeartbeatClientPoolHolder.INSTANCE;
    }
}
